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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.MappedSignatureToIdentityPlug do
alias Pleroma.Signature
alias Pleroma.User
alias Pleroma.Web.ActivityPub.Utils
import Plug.Conn
require Logger
def init(options), do: options
defp key_id_from_conn(conn) do
with %{"keyId" => key_id} <- HTTPSignatures.signature_for_conn(conn) do
Signature.key_id_to_actor_id(key_id)
else
_ ->
nil
end
end
defp user_from_key_id(conn) do
with key_actor_id when is_binary(key_actor_id) <- key_id_from_conn(conn),
{:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(key_actor_id) do
user
else
_ ->
nil
end
end
def call(%{assigns: %{user: _}} = conn, _opts), do: conn
# if this has payload make sure it is signed by the same actor that made it
def call(%{assigns: %{valid_signature: true}, params: %{"actor" => actor}} = conn, _opts) do
with actor_id <- Utils.get_ap_id(actor),
{:user, %User{} = user} <- {:user, user_from_key_id(conn)},
{:user_match, true} <- {:user_match, user.ap_id == actor_id} do
assign(conn, :user, user)
else
{:user_match, false} ->
Logger.debug("Failed to map identity from signature (payload actor mismatch)")
Logger.debug("key_id=#{key_id_from_conn(conn)}, actor=#{actor}")
assign(conn, :valid_signature, false)
# remove me once testsuite uses mapped capabilities instead of what we do now
{:user, nil} ->
Logger.debug("Failed to map identity from signature (lookup failure)")
Logger.debug("key_id=#{key_id_from_conn(conn)}, actor=#{actor}")
conn
end
end
# no payload, probably a signed fetch
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
with %User{} = user <- user_from_key_id(conn) do
assign(conn, :user, user)
else
_ ->
Logger.debug("Failed to map identity from signature (no payload actor mismatch)")
Logger.debug("key_id=#{key_id_from_conn(conn)}")
assign(conn, :valid_signature, false)
end
end
# no signature at all
def call(conn, _opts), do: conn
end
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